Greg Pomerantz
620d534454
- StateReader interface in ui package (Scale(), ScreenWidth(), ScreenHeight()) - State implements StateReader - Renderer reads scale/window size via interface, never imports editor - State fields are private (screenWidth, screenHeight, scale) with accessor methods - No SetScale/SetWindowSize calls from main.go — Renderer reads from State directly
105 lines
2.3 KiB
Go
105 lines
2.3 KiB
Go
package main
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import (
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"log"
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"os"
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"sync"
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"gioui.org/app"
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"gioui.org/op"
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"gioui.org/text"
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"gioui.org/unit"
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"gioui.org/font/gofont"
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"pad/internal/editor"
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"pad/internal/ui"
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)
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func main() {
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go func() {
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w := new(app.Window)
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w.Option(app.Title("Pad"))
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w.Option(app.Size(unit.Dp(390), unit.Dp(844)))
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if err := run(w); err != nil {
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log.Fatal(err)
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}
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os.Exit(0)
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}()
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app.Main()
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}
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func run(w *app.Window) error {
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var ops op.Ops
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shaper := text.NewShaper(text.WithCollection(gofont.Collection()))
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renderer := ui.New(ui.Theme{FontSize: 14}, shaper)
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// Initial DP size from app.Size() — used before we know the scale factor
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initialDPW := ui.Dp(390)
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initialDPH := ui.Dp(844)
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// Track previous scale to detect changes
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prevScale := float32(1.0)
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// Create logic instance with initial DP size and scale=1.0
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logic := editor.NewLogic(initialDPW, initialDPH)
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// Set State reference on Renderer — it reads scale/window size from State directly
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renderer.SetState(logic.State())
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// Shared state protected by mutex
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var mu sync.Mutex
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var elems []ui.Element
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// Start logic goroutine
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go logic.Run()
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// Start frame receiver goroutine
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go frameReceiver(w, &mu, &elems, logic.FrameChan())
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// Main event loop
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for {
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switch e := w.Event().(type) {
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case app.DestroyEvent:
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return e.Err
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case app.ConfigEvent:
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// Convert pixel dimensions to DP using current scale (starts at 1.0)
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dpW := ui.ToDp(ui.Px(e.Config.Size.X), 1.0)
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dpH := ui.ToDp(ui.Px(e.Config.Size.Y), 1.0)
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// Send config event to logic goroutine (in DP)
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logic.ConfigChan() <- editor.ConfigEvent{
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Width: dpW,
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Height: dpH,
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}
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case app.FrameEvent:
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gtx := app.NewContext(&ops, e)
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newScale := gtx.Metric.PxPerDp
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// If scale changed, send scale event to logic goroutine
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if newScale != prevScale {
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logic.ConfigChan() <- editor.ScaleEvent{Scale: newScale}
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prevScale = newScale
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}
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// Acquire mutex, read frame, draw, release mutex
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mu.Lock()
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currentElems := elems
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mu.Unlock()
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renderer.Draw(gtx, currentElems)
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e.Frame(&ops)
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}
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}
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}
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// frameReceiver runs in a separate goroutine and bridges frameChan to the main loop.
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func frameReceiver(w *app.Window, mu *sync.Mutex, elems *[]ui.Element, frameChan <-chan []ui.Element) {
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for {
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frame := <-frameChan
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mu.Lock()
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*elems = frame
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w.Invalidate()
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mu.Unlock()
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}
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}
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